Re: How to differ mouse click and drag?

"Mubashir Khan" <>
Mon, 19 Mar 2007 07:41:40 -0500
It is very unlikely that mouse up is sent without mouse move .... specially
if a user is performing this activity .... the cursor may misplace every
time down and up (simply click) is performed and this generates mouse move
events ..... i suggest u one thing ... take care of this programmatically
....... and if u are going to provide both click and drag functionality for
some window ... consider using dblclick instead of click ... this will even
make users life a bit easier ......

"vicky" <> wrote in message

Hi All!

I am having a problem regarding mouse capture. I am capturing mouse
events in my LBUTTONDOWN Handler but i am unable to differ between
click (Mouse down and UP) and drag(Mouse down -> move -> up).
When i am expecting single click windows fires mouse move too. at
first time it runs fine but for subsequent clicks it gives me msg
"Mouse L-Button UP, After Mouse Move.".

What to do now?

Following is my code in which i am capturing mouse events on

void CMouseCaptureView::OnLButtonDown(UINT nFlags, CPoint point)

  CPoint pt;
  for (;;)

     MSG msg;

     CWnd *pwnd = AfxGetApp()->GetMainWnd();
     HWND hwnd = pwnd->GetSafeHwnd();


     case WM_MOUSEMOVE:
        RECT rc;
        bMove = TRUE;
        pt = msg.lParam ;
           if(hwnd != GetCapture()->GetSafeHwnd() )

     case WM_LBUTTONUP:

           bMove = FALSE;
           AfxMessageBox("Mouse L-Button UP, After Mouse Move.");
           AfxMessageBox("Mouse L-Button UP.");

     case WM_TIMER:

     }//End of switch

     // release the mouse (if we still own it)
     if (GetCapture() == this) ::ReleaseCapture();

  }//End of For

  CView::OnLButtonDown(nFlags, point);

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